Receiver for wireless-transmission signals.



V. POULSEN.

RECEIVER FOR WIRELESS TRANSMISSION SIGNALS. 'APPLIGATION FILED FEB. 7, 1911.

1,087,549,. I Patented Feb. 17, 1914.

nrrnn snares Parana. OFFICE.

VALDEMAR rorns'nn, or COPENHAGEN, DENM RK."

nncnrvna roa WIRELESS-TRANSMISSION SIGNALS.

Specification of Letters Patent. Patented Feb, 17, 1914.

Original application filed September is, 1905, Serial No. 278,777. Divided and this application filed February 1 To all whom it may concern."

Be it known that I, VALDE'MAI: POULSEN, a subject of the King of Denmark, residing at St. Blichersvej No. 22, Copenhagen,.Denmark, have invented certain new and useful improvements in Receivers for VVireless- Transmission Signals, of which the following is a full, clear, and exact description.

This invention relates to the wireless transmission of signals, the present application being a division of my Patent. No.

' j 1,059,391, granted April 22, 19-13.

20 system, however, it is impossible to obtain the In the majority of transmitters now employed in wireless telegraphy, the oscilla-. tions are not only rapidly damped, but also have a comparatively long interval between each interruption, and it is the common practice to use in the receiving system a ma detector, which is permanently con-- nected to the receiving circuit. In such a highest degree of resonance, since the dampening of the oscillations and the intervals between them tend to prevent resonance. In order to obtain' .the big est degree of resonance it is desirable to use a transmitter comprising a generator of'some character that is capable of sending out the waves continuously and uniformly for instance the generator as described in my U. S. Patents Nos. 7 89449 and 798608. Transmitters employing generators of thischaracter tend to produce vibrations in the receiving device of a tuned system, of the highest amplitude. Butin experiments with such apparatus, I have found when the wave detector is permanently connected to the resonant circuit,

" that the damping of said circuit is increased and consequently the amplitudedecreased.

The object of the present invention is,

therefore to provide a system in which the highest posslble resonance is obtained in the receiver, and is not interfered with by other devices or apparatus forming a part of the tuned receiving system. I

The invention comprises means whereby the wavedetector forming a part of the receiving system isonly intermittently con nected with the receiving system proper or resonant circuit, whereby the intervals of disconnection will afiord time for the vibrations to build upto the highest amplitude undisturbed by the wave detector. In carryin out my invention, a terminal or the terminals ofthe wave detector, is, or are,

Serial No. 607,189.

alternately connected with and disconnected I from the resonant circuit by means of an ordinary vibrator similar to that used in anelectric bell.

Referring to the accompanying drawings, Figures 1 and 2 illustrate diagrammatic examples of the arrangement of a, receiving system according to my invention.

The two figures show modifications in the manner of connecting up the various apparatuses, all within the scope of the invention. v

1 indicates the antenna, a the receiving coil or resonance, 2 the earth connection, I the coherer or wave indicator or detector, either chemical or any other sort, having the terminals 6 and c; R the relay in the local circuit, which also includes the battery d.

tery from the local circuit through the coil a when the vibrator is in contact at e. I

Fig. 2 'is a diagram ofa receiving-coil a combined with a magnetic; detector diagrammatically illustrated iii which the intermittent contact is efi'ecte'd between the contacts'b ande. Such a magnetic detector .is'diagrammatically illustrated in this figure and includes a transformer a through which an iron wire '11 is moved and magnetized by means. of'a battery w. The current from this battery flows through one coil of the transformer giving the iron wire a certain In thiscase the condenser h is in- 7 sorted between the terminal 0 of the coherer andthe coil a to prevent the flow of batmagnetization. If currents flow in the other'coil this magnetization will be partly broken down and the detector '11 will re= spond. I

The means for obtaining the intermittent connections between the terminal 72 and the contact 6 may be greatly varied, the particular means being, not of great importance in connection with my invention. It may I be done. forinstance by means of vibrating wires, tuning forks, etc.,..or by means of rotary interrupters' or commutators.

WhatI claim, is: r F 1. In a. receiver for wireless'transmission of signals, the combination of a wave de-' tector, a. device which receives energy from space, and a circuit independent of said device, means for intermittently disconnecting the Wave detector fromsaid device, and a source of extraneous power for continuously operating said means, whereby said detector is continuously in said circuit independent of said device.

2. In a receiver for Wireless transmisslon of signals, the combination of a Wave detector, a device which receives energy from space, a circuit independent of said device and having an electrically operated appliance therein, a source of current forsaid circuit, and means for intermittently connecting the wavedetector and the device aforesaid, the latter being maintained at all times out of circuit With saidcurrent source, and the Wave detector having current from said source normally passing contimn'msly therethrough.

3. In a receiver for wireless transmission of signals, the combination of a wave detector, a device which receives energy from \Vi tnesses VIGGO BLOM,

C. V. SCHON. 

